CFripper

Library and CLI tool for analysing CloudFormation templates and check them for security compliance.

Docs available in https://cfripper.readthedocs.io/

CLI Usage

Normal execution

$ cfripper /tmp/root.yaml /tmp/root_bypass.json --format txt
Analysing /tmp/root.yaml...
Not adding CrossAccountTrustRule failure in rootRole because no AWS Account ID was found in the config.
Valid: False
Issues found:
	- FullWildcardPrincipalRule: rootRole should not allow wildcards in principals (principal: '*')
	- IAMRolesOverprivilegedRule: Role 'rootRole' contains an insecure permission '*' in policy 'root'
Analysing /tmp/root_bypass.json...
Valid: True

Using resolve flag

$ cfripper /tmp/root.yaml /tmp/root_bypass.json --format txt --resolve
Analysing /tmp/root.yaml...
Not adding CrossAccountTrustRule failure in rootRole because no AWS Account ID was found in the config.
Valid: False
Issues found:
	- FullWildcardPrincipalRule: rootRole should not allow wildcards in principals (principal: '*')
	- IAMRolesOverprivilegedRule: Role 'rootRole' contains an insecure permission '*' in policy 'root'
Analysing /tmp/root_bypass.json...
Not adding CrossAccountTrustRule failure in rootRole because no AWS Account ID was found in the config.
Valid: False
Issues found:
	- IAMRolesOverprivilegedRule: Role 'rootRole' contains an insecure permission '*' in policy 'root'
Monitored issues found:
	- PartialWildcardPrincipalRule: rootRole contains an unknown principal: 123456789012
	- PartialWildcardPrincipalRule: rootRole should not allow wildcard in principals or account-wide principals 
(principal: 'arn:aws:iam::123456789012:root')

Using json format and output-folder argument

$ cfripper /tmp/root.yaml /tmp/root_bypass.json --format json --resolve --output-folder /tmp
Analysing /tmp/root.yaml...
Not adding CrossAccountTrustRule failure in rootRole because no AWS Account ID was found in the config.
Result saved in /tmp/root.yaml.cfripper.results.json
Analysing /tmp/root_bypass.json...
Not adding CrossAccountTrustRule failure in rootRole because no AWS Account ID was found in the config.
Result saved in /tmp/root_bypass.json.cfripper.results.json